Research Progress of Metal/Mercury Cadmium Telluride Contacts
金属/碲镉汞接触研究的发展

The development status of metal/mercury cadmium telluride (Hg1-xCdxTe, MCT) contacts including basic concepts, growth structure, chemical reactivity and electrical properties is presented. There are two types of metal/MCT contacts: electronic (ohm) type and rectifying (Shottky) type. Ohm contacts are the important parts of MCT infrared detectors. They can determine the performance and reliability of MCT devices. Ohm contacts have low resistance and good adhesion to MCT material. They can keep stable behavior against thermal cycling. Since the metal with a larger work function is needed, the contact is difficult to realize for p-type MCT. For n-type MCT, the contacts can be realized with a large variety of metals.